A series of American Idiom derived from baseball.
Used primarily by teen and pre-teen boys to indicate what they have done
with their female date. The following is the standard list although there
are variations.

(yes, this writeup is very uncharacteristic of me; I was shocked when I visited this node that there wasn't already a "four Fs" writeup here, which with the vast depth and breadth of sex-related content on e2, so what could I do but throw in my two cents?)